Terms in this set (59)
Sclera and Cornea
Dense fibrous connective tissues, creates white of the eye, tendons of extrinsic eye muscles insert here, blood vessels and nerves exit here
Most sensitive due to many nerve endings, No blood vessels, only collagen fibers, gets nourishment from tears and aqueous humor
Choroid, ciliary body, and iris
Contains melanin to help absorb excess light, contains blood vessels to provide nourishment ro retina.
Contains the ciliary process and the ciliary muscle
Secretes aqueous humor
Controls shape of the lends by suspensory ligament
Separates anterior and posterior chambers, blood vessels, and pigmented cells.
What 2 intrinsic muscles are located in the iris
Dilator pupillae and constrictor pupillae
Dim light vision, located around periphery retina
Color and visual acuity, located at fovea
3 types of cones
S-cones, M-cones, L-cones
Are rods and cones evenly distributed?
What forms the optic nerve?
Axons of ganglion
What is the blind spot?
no photoreceptor cells
Made of protein which gives it elasticity, separated the anterior and posterior cavities
the process by which the eye's lens changes shape to focus near or far objects on the retina
Lens becomes cloudy, light can't come in (no vision).
irregular curvature of the cornea or lens of the eye
Between the iris and cornea
Between the lens and iris
fluid in the eye, found between the cornea and the lens
Canal of Schlemm
Outer portion of the cornea that reabsorbs aqueous humor
Bending of light from one medium to the next
The lens loses the ability to change its shape, lens can't bulge, loss of elasticity
Eyeball is too long, nearsightedness
How is the lens accommodating for near vision in myopic person
Lens must be flattened to see things close by
Eyeball too short, far sightedness
How is the lens accommodating for distant vision in a hyperopic person
Lens bulges to see far away objects
Auricle, external auditory canal, tympanic membrane
Middle Ear Ossicles
Malleus, Incus, Stapes
Cochlea, semicircular canals, vestibule
Collect sound waves and funnel them into auditory canal
External auditory canal
Travels through temporal bone
Stratifies squamous epithelium on external surface and simple cuboidal on inner surface, vibrates when a sound comes in
Amplify the sound waves and transmit them to the inner ear
Attached to tympanic membrane
Attached to malleus and stapes
Attached to incus and oval window
Auditory (Eustachian) Tube
Connects middle ear cavity to nasopharynx (back of throat), equalizes pressure in middle ear
Infection of the middle ear. Have to take oral medication because the bacteria will get past the tympanic membrane
Hearing, consists of oval window, cochlear duct, and round window.
Rotate the head
Infection of the internal ear that often leads to vertigo and nausea
Organ of Corti
Center part of the cochlea, containing hair cells, canals, and membranes
Damage to sensory pathway, stroke, damage to CN VIII, medulla, thalamus, temporal lobe
Something blocking passage ways or repeated ear infection cause the structures not to move as well as they should. Can't hear. Any damage that occurs to the structure of the external, middle, or inner ear.
Repeated odors cause a decrease in stimulation and action potential is generated
Sensitive, doesn't take much to stimulate olfactory receptors.
Located in the papillae of tongue, chemoreceptors
6 types of taste that can be discriminated
Sweet, salty, sour, bitter, umali (amino acids and proteins)
Three cranial nerves that carry impulses for taste
Facial (CN VII), Glossopharyngeal ( CN IX), and Vagus (CN X)
Why would a patient with chronic dry mouth have difficulty tasting food?
All the chemoreceptors wouldn't work